65 lines
2.2 KiB
JavaScript
65 lines
2.2 KiB
JavaScript
import { YError } from './yerror.js';
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import { parseCommand } from './parse-command.js';
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const positionName = ['first', 'second', 'third', 'fourth', 'fifth', 'sixth'];
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export function argsert(arg1, arg2, arg3) {
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function parseArgs() {
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return typeof arg1 === 'object' ?
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[{ demanded: [], optional: [] }, arg1, arg2]
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: [parseCommand(`cmd ${arg1}`), arg2, arg3];
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}
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try {
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let position = 0;
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const [parsed, callerArguments, _length] = parseArgs();
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const args = [].slice.call(callerArguments);
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while (args.length && args[args.length - 1] === undefined) args.pop();
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const length = _length || args.length;
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if (length < parsed.demanded.length) {
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throw new YError(
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`Not enough arguments provided. Expected ${parsed.demanded.length} but received ${args.length}.`
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);
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}
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const totalCommands = parsed.demanded.length + parsed.optional.length;
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if (length > totalCommands) {
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throw new YError(
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`Too many arguments provided. Expected max ${totalCommands} but received ${length}.`
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);
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}
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parsed.demanded.forEach((demanded) => {
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const arg = args.shift();
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const observedType = guessType(arg);
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const matchingTypes = demanded.cmd.filter(
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(type) => type === observedType || type === '*'
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);
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if (matchingTypes.length === 0)
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argumentTypeError(observedType, demanded.cmd, position);
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position += 1;
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});
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parsed.optional.forEach((optional) => {
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if (args.length === 0) return;
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const arg = args.shift();
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const observedType = guessType(arg);
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const matchingTypes = optional.cmd.filter(
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(type) => type === observedType || type === '*'
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);
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if (matchingTypes.length === 0)
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argumentTypeError(observedType, optional.cmd, position);
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position += 1;
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});
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} catch (err) {
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console.warn(err.stack);
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}
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}
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function guessType(arg) {
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if (Array.isArray(arg)) {
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return 'array';
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} else if (arg === null) {
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return 'null';
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}
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return typeof arg;
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}
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function argumentTypeError(observedType, allowedTypes, position) {
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throw new YError(
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`Invalid ${positionName[position] || 'manyith'} argument. Expected ${allowedTypes.join(' or ')} but received ${observedType}.`
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);
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}
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